Metal-bending tool



the tool, on a reduced scale. f

, MnTAL-BENDINGTOOI..

` Application med Apriiza, 1921; seiiaij-Ifo.465,491,"v

To @ZZ whom it may concern:

Be it known that I, EDWARD A MULL, a

4citizen of the United States, and a resident of Wauseon, in the county of VFulton andy State of Ohio, have made an Invention Ap- -pertaining to Metal-Bending Tools; and I do hereby declare the following to be a full,

` clear, and exact description of the invention,

such as. will enable others skilledin the art to which it appertains to make and use the same, reference -being had to the accompanying drawings, and to the characters of reference marked thereon, which form a part of this specilication. Y

My invention has for its ob] ect to lprovide a tool for bending sheet metal lso as to `turn 'one'edge of the metal so as to produce ya flange extending from the bodyl of the sheet metal in a curved line, and at the same time 4to so form the flange that it `will hold the Ybody of the sheet 'metal in a curved surface.Y

'Ihe invention particularly has for its Object 'to provide a tool wherebyf'autoinobile doors may be readilyformed and which will have a curved'upper flange that will produce aV finished appearance, and will at Ithe same time produce `a. curved surface-on the body portion of the door. Y

The invention maybecontained in structures of different forms, and to illustrate a practical application or embodimentof the invention I have selected a structure contai-ning the invention as van example ofsuch structures, and shall describe it hereinafter. The structure selected is illustrated in the accompanying drawings. l'

Figure 1 of the drawings is a Vtransverse sectional view of the tool. Fig. 2 is an end vand broken view of the tool'. Fig. 8 is a Asectional view showing the tool in a different position from that shown in Fig. 1. Fig. 4 shows an end viewv of the tool, the tool,

however, being shown open. Fig 5 is a top view of the tool. Fig. 6 is lan edge view of the sheet metal after it vhas been'bent. Fig.

7 is a perspective l.viewjof the door formed by lof the tool'is the main supporting block, -which has a concave surface 2 to correspond with the convex surface 3 -of the vdoor or other device that is to be shaped by manipulation of the tool. The surface 2 is formed `of two parts 4 and 5 that extend at a slight angle to each other so as to form the portions 6 and Tof the door. A movable block 8 is located Von a pair of rods 9 and is provided with the surface 10 that corresponds to the Vvmetalis to'be bent.

- concavesurface" 2 thatis Vformed of the conn TENT oFiC-"fp EDWARD n. r MULL, or 'wausnom onto. I v y, Y,

Patented J l Y cavesurfacesfetV and l5." "The Surfa'gl() is* convex in form to'it the lportions, tand of the 'surface 2. -At the' vertex of'jthe angle )between the surfaces 'there i is located al pair of rods :1'1 and 12 Athat extend the 'length of theipar'ts' 1 and V8. Thep'artsl vand 8 may be formed of-woodrif desired, :andthevrods 11 and 12`may be formed' of vmetal whichl will give greaterk rigidity at the corner where the The sheetV metal 13 Vis'inserted betweenuther` partsf1i'and '8 of the tool, as shown in Figli,

and V then the' block N8 is forcedtowards'the block 1 by means, of thejcams 14 to cause the l' sheet metal 13 tofbe bent inthe shape shown in Fig-i6, except the'lange' portion 15,which t" is subsequently formed.l `The cams 14 are pivotal-'ly andeccentrically connected to the pins 17'; After the sheet-:metal lyhas" been inserted 'in position the handles ,of-the' cams AMare, turnedrso as *tol cause the cams to force the block Stewards thepart 1v of thej tool,

and thus. the 'rst bendy made in the sheet 'rhe 'block 8f is' aisepmvided with aber 18 which formsafclampingjedge and "has the curvature fof-the-1portion 5-of the surface2. f

-tureto form-theicurvature`of the flanges 15,v -as shown in, Fig; 1 6. l A-fblock 19; is pivotally f connected to fthe block or supporting part 1 ofthe tool by pivots 'located substantially in line with the vupper edge of the-bar 18. lA l `v i pair of arms 20- are--corinectedto the block I 19, and a pair-'of arms-21 are secured tothe 'block 1 and are i pivotally connected together iby pivot pins located in theirends 22. The center lines of the pivot` pins are 'substan-j 'tial-ly' in -'l-in`e withfthe upper' edge ofthe bar18.'

A pai-r .of`bars'23 and 2dr-are; provided thatv may be clamped on opposite sideslofthe porg iioof tionofthe sheet material that is to V-form the Y flange 15. The bars 23-Sa'nd 24 are rigid,'but v are suiciently flexible to bend under the lio bar 18 and fis clamped by means .of the Y' 22 of the arms 2O and 21.

clamps 25 that has a screvs7 26 that extends through openings formed in the block 19 and so as to press against the bar 24C. In order to hold the clamps 25 in place the block 19 may be recessed, and portions of the brace or body of the clamp may be inserted in the recess thus formed. The block 19 is then moved angularly about the pivot pin located in the ends 22 of the arms 20 and 21, and the clamps and the bars 23 and 24 are carried over with the block 19. i

In order to produce the curvature of the flangel l5, the block 19 is provided With a plurality of cams 27 that are pivotally and eccentrically connected to the block 19 and are located in recesses formed in the block. lhey are provided With handles 28 that extend through brackets 29 that are secured to the supporting part 1 of the tool. The handles 28, however, slide in the brackets 29 when the block 19 is turned over, since the pivot pins of the cams 27 are not in alignment With the pivot pins located in the ends The cams 27, When the block 19 is in the position shown in Fig. 1, have their surfaces located in definite relation relative to the surface of the block, and so as to make contact With the surfacev of the bar 211. The position of the surfaces of the cams 27 may be varied according to the curvature that it is desired to form in the flange 15, and according to the relative position of each of the cams With reference to the center line of the sheet material extending through the body of the sheet material yand the flange. When, therefore, theblock 19 is turned over the cams 27 follovv the movement of the bars 23 and 2l and bend in response to the pressure of the surfaces of the cams 27 since the bars are pushed under the cams 27, as shovvn in Fig.

3. rl`his operates to draw 'the metal along thecenter line extending through the center of the body of the sheet material and the flange, While the ends ofthe bars may be dipped down to cause the flange to conform Y to the curvature desired to be produced in the flange.

bevelled edges, particularly at their ends, in

orderthat they'maybe turned sharply relal tive to each Other.

The tool may be opened for performing sequential operations of the tool by opening the blocks 1 and 8, which is done by merely drawing the arms of the cams 14 outward, or to the oppositersides lof the pivot pins 17. The blocks 1 and 8 are provided With recesses n which are located the compression springs 30 Which will cause immediate separation of the blocks 1 and 8. rlhe block 8 will slide along the, rods 9. The clamps 25 may then be opened andthe bars 23 and 2l removed and the shaped sheet material article removed.r The operations may be repeated, thus quickly l bending successive sheets .of metal into the desired form.

f claim: 1. 1n ametal bending tool, a block having a surface conforming to the surface of the article vthat it is desired to form, a second lock having a surface matching the surface of the first named block, means for clamping the blocks together to bend the sheet metal, a pair of clamping members, means for rotating the clamping members, and means for moving portions of the clamping members through greater lengths during their rotation than other portions of the clamping members.

2. In a metal bending tool, a member having a surface conforming to the shape of the surface of the article to be formed, a second member having a similar surface, means for clamping the members, a pivoted member having flexible clamping parts, and means for positively altering the shape of the flexible clamping parts as the pivoted member is moved rabout the axis of its pivot.

3. In a metal bending tool, a member having a surface conforming to the shape of the surface of the article to be formed, a second member having a similar surface, means for clamping the members, a pivoted member having flexible clamping parts, and means for positively altering the shape and position of the 'flexible clamping parts as theV ,clamping f parts as the pivoted member is moved about the axis of its pivot.

5. In a metal bending tool, a member 'having a surface conforming to the shape of the lsurface yof the article to be formed, a second member having a similar surface, means for clamping the members, a third member having a flexible clamping means, and means for altering the shape and position of the flexible clamping means and pivotally connected to the said third member.

6. -In a metal bending tool, a member havf ing a surface conforming to the shape of the surface of the article to be formed, a second member having a similar surface, means for ,clamping the members, a third member piv- EDWARD A. MULL.y 

